[jira] [Updated] (HDFS-16669) Enhance client protocol to propagate last seen state IDs for multiple nameservices.

["ASF GitHub Bot (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HDFS-16669?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

ASF GitHub Bot updated HDFS-16669:
----------------------------------
    Labels: pull-request-available  (was: )

> Enhance client protocol to propagate last seen state IDs for multiple nameservices.
> -----------------------------------------------------------------------------------
>
>                 Key: HDFS-16669
>                 URL: https://issues.apache.org/jira/browse/HDFS-16669
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Simbarashe Dzinamarira
>            Assignee: Simbarashe Dzinamarira
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> The RPCHeader in the client protocol currently contains a single value to indicate the last seen state ID for a namenode.
> {noformat}
> optional int64 stateId = 8; // The last seen Global State ID
> {noformat}
> When there are multiple namenodes, such as in router based federation, the headers need to carry the state IDs for each of these nameservices that are part of the federation.
> This change is a prerequisite for HDFS-15522: RBF: Support observer node from Router-Based Federation



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